投影转经纬度private IPoint PRJtoGCS(double x, double y)IPoint pPoint = new PointClass();pPoint.PutCoords(x, y);ISpatialReferenceFactory pSRF = new SpatialReferenceEnvironmentClass();pPoint.SpatialReference = pSRF.CreateProjectedCoordinateSystem(2414);pPoint.Project(pSRF.CreateGeographicCoordinateSystem(int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);return pPoint;其中，pPoint.SpatialReference = pSRF.CreateProjectedCoordinateSystem(2414);这行代码是设置 pPoint 的空间参考，也就是要转化的点的投影坐标。如果不知道投影坐标的话，转化会报异常。2414为该投影的 enum 值pPoint.Project(pSRF.CreateGeographicCoordinateSystem(int)esriSRGeoCSType.esriSRGeoCS_Beijing1954);将该点的投影坐标转化为经纬度。经纬度到投影：view sourceprint?1Code highlighting produced by Actipro CodeHighlighter (freeware)http:/www.CodeHighlighter.com/private IPoint GCStoPRJ(IPoint pPoint,int GCSType,int PRJType) ISpatialReferenceFactory pSRF = new SpatialReferenceEnvironmentClass(); pPoint.SpatialReference = pSRF.CreateGeographicCoordinateSystem(GCSType); pPoint.Project(pSRF.CreateProjectedCoordinateSystem(PRJType); return pPoint; 2 3 4 5 6 7附：球面坐标esriSRGeoCS_WGS1984 4326 WGS 1984. esriSRGeoCS_Beijing1954 4214 Beijing 1954. 平面坐标/北京54六度带esriSRProjCS_Beijing1954GK_13 21413 Beijing 1954 GK Zone 13. esriSRProjCS_Beijing1954GK_14 21414 Beijing 1954 GK Zone 14. esriSRProjCS_Beijing1954GK_15 21415 Beijing 1954 GK Zone 15. esriSRProjCS_Beijing1954GK_16 21416 Beijing 1954 GK Zone 16. esriSRProjCS_Beijing1954GK_17 21417 Beijing 1954 GK Zone 17. esriSRProjCS_Beijing1954GK_18 21418 Beijing 1954 GK Zone 18. esriSRProjCS_Beijing1954GK_19 21419 Beijing 1954 GK Zone 19. esriSRProjCS_Beijing1954GK_20 21420 Beijing 1954 GK Zone 20. esriSRProjCS_Beijing1954GK_21 21421 Beijing 1954 GK Zone 21. esriSRProjCS_Beijing1954GK_22 21422 Beijing 1954 GK Zone 22. esriSRProjCS_Beijing1954GK_23 21423 Beijing 1954 GK Zone 23. esriSRProjCS_Beijing1954GK_13N 21473 Beijing 1954 GK Zone 13N. esriSRProjCS_Beijing1954GK_14N 21474 Beijing 1954 GK Zone 14N. esriSRProjCS_Beijing1954GK_15N 21475 Beijing 1954 GK Zone 15N. esriSRProjCS_Beijing1954GK_16N 21476 Beijing 1954 GK Zone 16N. esriSRProjCS_Beijing1954GK_17N 21477 Beijing 1954 GK Zone 17N. esriSRProjCS_Beijing1954GK_18N 21478 Beijing 1954 GK Zone 18N. esriSRProjCS_Beijing1954GK_19N 21479 Beijing 1954 GK Zone 19N. esriSRProjCS_Beijing1954GK_20N 21480 Beijing 1954 GK Zone 20N. esriSRProjCS_Beijing1954GK_21N 21481 Beijing 1954 GK Zone 21N. esriSRProjCS_Beijing1954GK_22N 21482 Beijing 1954 GK Zone 22N. esriSRProjCS_Beijing1954GK_23N 21483 Beijing 1954 GK Zone 23N. /北京54三度带esriSRProjCS_Beijing1954_3_Degree_GK_CM_102E 2431 Beijing 1954 3 Degree GK CM 102E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_105E 2432 Beijing 1954 3 Degree GK CM 105E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_108E 2433 Beijing 1954 3 Degree GK CM 108E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_111E 2434 Beijing 1954 3 Degree GK CM 111E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_114E 2435 Beijing 1954 3 Degree GK CM 114E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_117E 2436 Beijing 1954 3 Degree GK CM 117E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_120E 2437 Beijing 1954 3 Degree GK CM 120E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_123E 2438 Beijing 1954 3 Degree GK CM 123E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_126E 2439 Beijing 1954 3 Degree GK CM 126E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_129E 2440 Beijing 1954 3 Degree GK CM 129E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_132E 2441 Beijing 1954 3 Degree GK CM 132E. esriSRProjCS_Beijing1954_3_Degree_GK_CM_135E 2442 Beijing 1954 3 Degree GK CM 135E. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_25 2401 Beijing 1954 3 Degree GK Zone 25. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_26 2402 Beijing 1954 3 Degree GK Zone 26. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_27 2403 Beijing 1954 3 Degree GK Zone 27. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_28 2404 Beijing 1954 3 Degree GK Zone 28. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_29 2405 Beijing 1954 3 Degree GK Zone 29. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_30 2406 Beijing 1954 3 Degree GK Zone 30. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_31 2407 Beijing 1954 3 Degree GK Zone 31. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_32 2408 Beijing 1954 3 Degree GK Zone 32. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_33 2409 Beijing 1954 3 Degree GK Zone 33. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_34 2410 Beijing 1954 3 Degree GK Zone 34. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_35 2411 Beijing 1954 3 Degree GK Zone 35. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_36 2412 Beijing 1954 3 Degree GK Zone 36. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_37 2413 Beijing 1954 3 Degree GK Zone 37. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_38 2414 Beijing 1954 3 Degree GK Zone 38. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_39 2415 Beijing 1954 3 Degree GK Zone 39. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_40 2416 Beijing 1954 3 Degree GK Zone 40. esriSRProjCS_Beijing1954_3_Degree_GK_Zone_41 2417 Beijing 1954 3 Degree GK Zone 41. esriSRProjCS_Beijing1954_3_Degr